• 제목/요약/키워드: Sand casting magnesium alloy

검색결과 5건 처리시간 0.021초

파이버 레이저를 이용한 이종 마그네슘 합금의 용접성에 관한 연구 (The Weldability of the Dissimilar Magnesium Alloy Welded by Fiber Laser)

  • 김종도;김영식;송무근;이정한
    • Journal of Welding and Joining
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    • 제31권2호
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    • pp.63-68
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    • 2013
  • Magnesium alloys have gained increased attention in recent years as the structural materials, because of their attractive properties such as good specific strength, excellent sound damping capability. However, to expand their applications, a reliable joining process is absolutely necessary. In this study, a CW fiber laser was used to investigate the lap weldability of sand casting and wrought magnesium alloys. The effect of defocused distance on lap weldability was examined, and it was found that spatters always generated at the around focused distance because of the high power density of the laser beam. Thus, defocused distance was required to obtain sound welds. In addition, the application of fillet welding was evaluated for minimizing the affect of sand casting magnesium alloy that have relatively poor weldability. As a result of this study, we could confirm good weldability without weld defects.

레이저 열원을 이용한 마그네슘 합금의 용접성에 관한 연구 (III) - Pulsed Nd:YAG 레이저를 이용한 사형주조 마그네슘 합금의 맞대기 용접성 - (A Study on the Weldability of Magnesium Alloy by Laser Heat Source (III) - Butt Weldability of Sand Casting Magnesium Alloy using Pulsed Nd:YAG Laser -)

  • 김종도;이정한;이문용
    • Journal of Welding and Joining
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    • 제31권2호
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    • pp.57-62
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    • 2013
  • Magnesium has good castability and limited workability, so its products have been manufactured by almost casting processes. In this study, a pulsed Nd:YAG laser was used to butt-weld the sand casting magnesium alloys. And the effect of welding conditions such as peak power, pulse width, welding speed was evaluated in detail. As a result of this study, large underfill and plenty of spatter taken place under the conditions with high peak power. Thus, it is recommended to use low peak power and long pulse width to obtain good welds with deep penetration. It is also confirmed that the welding speed and pps(pulse per second) are directly connected at weld defects such as underfill, porosity.

사형 주조 마그네슘 합금의 인장 특성에 미치는 합금 원소와 결정립 미세화의 영향 (Effects of Alloying Element and Grain Refinement on the Tensile Properties of Mg-Alloy Casted with Sand Mold)

  • 한재준;권해욱
    • 한국주조공학회지
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    • 제31권4호
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    • pp.212-217
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    • 2011
  • The effects of alloying element and grain refinement on the tensile properties of magnesium alloy poured into sand mold were investigated. The strength of magnesium alloy was greatly increased by the addition of aluminium and that was increased with the increased aluminum content added up to 8.10 wt% and decreased beyond that. Even though the strength of Mg-8.10 wt%Al alloy was rather decreased by the addition of zinc, that was increased with increased zinc content added up to 0.50 wt% and decreased with the increased one beyond that. The maximum tensile strength was obtained with 0.50 wt%Mn added. The strength and elongation were simultaneously increased with grain refinement and the optimum amount of strontium addition for this was 0.30 wt%. The optimum chemical composition was obtained and the yield strength, tensile strength and elongation of the alloy with this composition were 90.2, 176.3MPa and 4.43%, respectively.

Mg-5Al-2Si 합금의 조직 및 부식특성에 미치는 Sb, Sr 첨가의 영향 (Effect of Sb and Sr Addition on Corrosion Properties of Mg-5Al-2Si Alloy)

  • 전종진;이상원;김병호;박봉규;박용호;박익민
    • 대한금속재료학회지
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    • 제46권5호
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    • pp.304-309
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    • 2008
  • Magnesium alloys containing $Mg_2Si$ particles, as a promising cheap heat-resistant magnesium alloy for automobile power train parts applications, are attracting more attention of both material scientists and design engineers. Modification of the Chinese script shape $Mg_2Si$ particle is a key for using this alloy in sand or permanent mould casting. In the present work, the modification effect of Sr and Sb on the corrosion properties of the Mg-5Al-2Si alloy was investigated. Sr or Sb addition promoted the formation of fine polygonal shape $Mg_2Si$ particles by providing the nucleation sites. Sr was more effective element than Sb for shape modification of Chinese script shape $Mg_2Si$. Such improved microstructure of the modified alloy resulted in large improvement in corrosion resistance as compared to unmodified Mg-5Al-2Si alloy.